Multiplying, dividing and mixed operations · Ages 8–9

Multiplying tens and hundreds by one digit worksheet

Part of: Multiplying by a one-digit number

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Multiplying, dividing and mixed operations · Ages 8–9

Numsprite
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Write each answer in the space. For word problems, show your working and write a sentence answer.

1.80 × 5: 80 is 8 tens, and 8 tens times 5 makes tens, that is .
Fill in each blank
Answer:
2.40 × 2 =
Answer:
3.10 × 4 =
Answer:
4.700 × 6 =
Answer:
5.12 × 2 = 10 × 2 + 2 × 2 = + =
Fill in each blank
Answer:
6.30 × 4 =
Answer:
7.400 × 5 =
Answer:
8.22 × 3 = 20 × 3 + 2 × 3 = + =
Fill in each blank
Answer:
9.90 × 7 =
Answer:
10. × 6 = 420
Answer:

13.Tsz-ching's family buys 5 theme park tickets at $80 each. How much do they pay altogether?
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14.A tour has 4 coaches with 50 seats each. 163 people have got on. How many seats are still empty?
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15.A box holds 50 pencils. How many pencils are there in 9 boxes?
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16.A row in a cinema has 31 seats. How many seats are there in 2 rows?
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17.A pack of copy paper has 500 sheets. How many sheets are there in 7 packs?
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18.A tour has 4 coaches with 50 seats each. 135 people have got on. How many seats are still empty?
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Show the answers and working

Multiplying tens and hundreds by one digit worksheet: Answers and working

1. 40, 400
80 is 8 tens. Work out 8 × 5 first: that's how many tens you get.
8 × 5 = 40, and 40 tens is 400.
2. 80
40 is 4 tens. Work out 4 × 2 first, then think of it as that many tens.
4 tens times 2 is 8 tens: 80.
3. 40
10 is 1 tens. Work out 1 × 4 first, then think of it as that many tens.
1 tens times 4 is 4 tens: 40.
4. 4200
700 is 7 hundreds. Work out 7 × 6 first. How many 0s go back on at the end?
7 hundreds times 6 is 42 hundreds: 7 × 6 = 42, then two 0s, 4200.
5. 20, 4, 24
Split 12 into 10 and 2, multiply each by 2, then add the two products.
Tens: 10 × 2 = 20; ones: 2 × 2 = 4; 20 + 4 = 24.
6. 120
Leave the 0 aside and work out 3 × 4; put the 0 back at the end.
First 3 × 4 = 12, then put the 0 back: 120.
7. 2000
400 is 4 hundreds. Work out 4 × 5 first. How many 0s go back on at the end?
4 hundreds times 5 is 20 hundreds: 4 × 5 = 20, then two 0s, 2000.
8. 60, 6, 66
Split 22 into 20 and 2, multiply each by 3, then add the two products.
Tens: 20 × 3 = 60; ones: 2 × 3 = 6; 60 + 6 = 66.
9. 630
Leave the 0 aside and work out 9 × 7; put the 0 back at the end.
First 9 × 7 = 63, then put the 0 back: 630.
10. 70
□ is a multiple of ten. What multiple of ten times 6 makes 420? You could also work out 420 ÷ 6.
420 is 6 lots of □: 420 ÷ 6 = 70. Check: 70 × 6 = 420.

11. True
40 is 4 tens. Work out 4 × 9, put the 0 back, and compare with 360: are there the right number of 0s?
4 tens times 9: 40 × 9 = 360.
12. False
50 is 5 tens. Work out 5 × 6, put the 0 back, and compare with 3000: are there the right number of 0s?
5 tens times 6: 50 × 6 = 300.

Marking: 2 for the working, 1 for the answer, 1 for the sentence.

13. 400 dollars
80 × 5: multiply the tens digit first, 8 × 5, then put the 0 back.
80 × 5 = 400.
14. 37 seats
First find how many seats there are: 4 coaches of 50. Then subtract the people already on.
50 × 4 = 200 seats, and 200 − 163 = 37.
15. 450 pencils
9 boxes are 9 lots of 50. 50 is 5 tens, so work out 5 × 9 first.
9 lots of 50: 50 × 9 = 450.
16. 62 seats
Split 31 into 3 tens and 1 ones, multiply each by 2, then add.
Split into tens and ones: 31 × 2 = 62.
17. 3500 sheets
500 is 5 hundreds. Work out 5 × 7, then put the two 0s back.
500 × 7: 5 hundreds times 7 gives 3500.
18. 65 seats
First find how many seats there are: 4 coaches of 50. Then subtract the people already on.
50 × 4 = 200 seats, and 200 − 135 = 65.

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